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#include "config.h"
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#if defined (HAVE_SYS_TERMIOS_H)
#include <sys/termios.h>
#else
#if defined (HAVE_TERMIOS_H)
#include <termios.h>
#endif
#endif
#include "gps.h"
#include "gpsd.h"
/* FIXME: these shouldn't be globals */
static struct termios ttyset, ttyset_old;
static int set_baud(long baud)
{
int speed;
if (baud < 200)
baud *= 1000;
if (baud < 2400)
speed = B1200;
else if (baud < 4800)
speed = B2400;
else if (baud < 9600)
speed = B4800;
else if (baud < 19200)
speed = B9600;
else if (baud < 38400)
speed = B19200;
else
speed = B38400;
return speed;
}
int gpsd_open(char *device_name, int device_speed, int stopbits)
{
int ttyfd;
gpsd_report(1, "opening GPS data source at %s\n", device_name);
if ((ttyfd = open(device_name, O_RDWR | O_NONBLOCK)) < 0)
return -1;
if (isatty(ttyfd)) {
gpsd_report(1, "setting speed %d, 8 bits, no parity\n", device_speed);
/* Save original terminal parameters */
if (tcgetattr(ttyfd,&ttyset_old) != 0)
return -1;
memcpy(&ttyset, &ttyset_old, sizeof(ttyset));
device_speed = set_baud(device_speed);
cfsetispeed(&ttyset, (speed_t)device_speed);
cfsetospeed(&ttyset, (speed_t)device_speed);
ttyset.c_cflag &= ~(PARENB | CRTSCTS);
ttyset.c_cflag |= (CSIZE & (stopbits==2 ? CS7 : CS8)) | CREAD | CLOCAL;
ttyset.c_iflag = ttyset.c_oflag = ttyset.c_lflag = (tcflag_t) 0;
ttyset.c_oflag = (ONLCR);
if (tcsetattr(ttyfd, TCSANOW, &ttyset) != 0)
return -1;
}
return ttyfd;
}
void gpsd_close(int ttyfd)
/* restore original terminal settings, but make sure DTR goes down */
{
if (ttyfd != -1) {
if (isatty(ttyfd)) {
#if defined (USE_TERMIO)
ttyset.c_cflag = CBAUD & B0;
#else
ttyset.c_ispeed = B0;
ttyset.c_ospeed = B0;
#endif
tcsetattr(ttyfd, TCSANOW, &ttyset);
ttyset_old.c_cflag |= HUPCL;
tcsetattr(ttyfd,TCSANOW,&ttyset_old);
}
close(ttyfd);
}
}
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